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Net Income (Loss) Per Share | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | 1 4. Net Income (Loss) Per Share The following is a reconciliation of the average shares outstanding used to compute basic and diluted income (loss) per common share:
|  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Basic weighted average common shares outstanding |  |  | 34,538,814 |  |  |  | 35,348,597 |  |  |  | 34,730,623 |  |  |  | 35,527,971 |
Effect of dilutive securities |  |  | — |  |  |  | 110,359 |  |  |  | — |  |  |  | 158,860 |
Diluted weighted average common shares outstanding |  |  | 34,538,814 |  |  |  | 35,458,956 |  |  |  | 34,730,623 |  |  |  | 35,686,831 |
Equity incentive instruments for which total employee proceeds from exercise exceed the average fair value of the same equity incentive instrument over the period have an anti-dilutive effect on earnings per share during periods with net income, and accordingly, are excluded from diluted weighted average common shares outstanding. Due to the net loss incurred during the three and nine months ended September 30, 2020, the assumed exercise of all equity instruments was anti-dilutive and, therefore, not included in the diluted weighted average common shares outstanding for those periods. Anti-dilutive equity instruments of 1,528,910 and 1,544,379 common shares were excluded from diluted weighted average common shares outstanding for the three and nine months ended September 30, 2019, respectively. No cash dividends were declared or paid during the three and nine months ended September 30, 2020 and 2019.

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